375 results about "Blue phase liquid crystal" patented technology

An optical element is provided, which can realize high speed response equivalent or more than that of conventional elements without depending on incident polarization.

A diffraction element 10 comprises transparent substrates 5 and 6, a grating 2A made of an isotropic refractive index solid material formed on the transparent substrate 5 and having a cross-sectional structure having a periodical concavo-convex shape, a blue phase liquid crystal 2B which fills the concave portions of grating 2A including a periodical concave-convex shape having a refractive index which changes isotropically, and transparent electrodes 3 and 4 for applying voltage to the blue phase liquid crystal 2B, wherein the grating 2A and the blue phase liquid crystal 2B constitutes a diffraction grating 1, and the diffraction element 10 has a construction that the refractive index of the blue phase liquid crystal 2B is changed by the voltage applied via the transparent electrodes 3 and 4.

[PROBLEMS] To provide a liquid crystal display device that does not need any surface aligning treatment, realizes striking increase of a response speed of movie display and is free from any light leakage (produce dark field) at black display.

[MEANS FOR SOLVING PROBLEMS] There is provided a liquid crystal display device comprising a pair of transparent substrates and, interposed therebetween, a polymer stabilized blue-phase liquid crystal. The liquid crystal display device utilizing the polymer stabilized blue-phase liquid crystal exhibits a large birefringence change upon application of an electric field to cell substrate in an in-plane direction. The polymer stabilized blue-phase liquid crystal is composed of a low-molecular liquid crystal capable of developing a blue phase between cholesteric phase and isotropic phase and a polymer network created in the low-molecular liquid crystal. Further, by optimizing the type and amount of chiral dopant added to the liquid crystal, there can be provided a liquid crystal display device that is free from any light leakage (produce dark field) at black display.

A blue phase liquid crystal composition and a LC display using the composition. The liquid crystal composition includes a first class including a highly polar compound and a second class including a highly conjugated liquid crystal compound. The blue phase liquid crystal display device includes first and second substrates each with polarizer on the exterior surface and the blue phase liquid crystal composition sandwiched therebetween with and patterned electrodes on one of the substrates or both substrates. The patterned electrodes can be T-shaped, chevron or v-shaped, thin comb like shape and can also be flat or trapezoidal. The device outputs different light transmissions from the electrically controllable induced birefringence of the blue phase LC material for a low driving voltage, high transmittance blue phase liquid crystal display device.

The invention provides a preparation method for a wide-temperature blue-phase liquid crystal composite material, comprising the following steps of: adding bent liquid crystal molecules such as oxadiazoles and thiophenes in a micro-molecular nematic mixed crystal according to a certain ratio, then adding one or more chiral compounds in a proper amount and having a helical twisting power (HTP) of 8-100 mum<-1>, so as to induce and broaden the temperature range of a blue-phase liquid crystal, wherein the temperature range can achieve 5-30 DEG C. The preparation method for a wide-temperature blue-phase liquid crystal composite material provided by the invention is simple in preparation and remarkable in effect; and the prepared system is good in stability, low in viscosity, and fast in the speed of a response to an electric field.

The invention discloses a transmission-reflection blue-phase liquid crystal display with a corrugated electrode. The liquid crystal display comprises an upper substrate, a transparent corrugated public electrode, a liquid crystal layer, a transparent corrugated pixel electrode, a lower substrate and a reflecting layer, wherein the upper substrate and the lower substrate are arranged in parallel and are partitioned into transmission regions and reflection regions; and the transmission regions and the reflection regions are made of the same blue-phase liquid crystal material. By adopting the following two schemes, the phase delay between the transmission region and the reflection region can be balanced and the transmission-reflection blue-phase liquid crystal display can be realized. In thescheme I: the same corrugated electrode inclination angle, i.e., alpha T=alpha R, is adopted for the transmission regions and the reflection regions, but different liquid crystal layer thicknesses, i.e., dT is less than dR, are adopted. In the scheme II: the same liquid crystal layer thickness, i.e., dT=dR, is adopted for the transmission regions and the reflection regions, but different corrugated electrode inclination angles, i.e., alpha T is more than alpha R, are adopted. Due to the adoption of the corrugated electrode in the transmission-reflection blue-phase liquid crystal display, the working voltage is reduced, the optical efficiency is increased, and the electrooptic property curves of the transmission regions and the reflection regions are well matched. Due to the adoption of the corrugated electrode, the manufacturing process is easier.

A liquid crystal display includes a first substrate, a gate line and first and second data lines disposed on the first substrate, a first thin film transistor connected to the gate line and the first data line, a second thin film transistor connected to the gate line and the second data line, a color filter disposed on the first substrate, a protrusion disposed on the color filter, a first pixel electrode including a first linear electrode disposed on the protrusion and connected to the first thin film transistor, a second pixel electrode including a second linear electrode disposed on the protrusion and connected to the second thin film transistor, a second substrate disposed facing the first substrate, and blue phase liquid crystal disposed between the first substrate and the second substrate.

An optical element able to realize a response equal to or faster than that of a conventional one without depending on an incident polarization. The optical element comprises transparent substrates (5, 6), a lattice (2A) formed on the transparent substrate (5) by using an isotropic-refractive-index solid material and having a sectional structure of a cyclic unevenness, blue-phase liquid crystals (2B) filled in the recesses of the lattice (2A) having cyclic unevenness and having refractive index thereof changed isotropically, and transparent electrodes (3, 4) for applying a voltage to the blue-phase liquid crystals (2B), wherein a diffraction element (10) is formed by diffraction lattices (1) each consisting of a lattice (2A) and a blue-phase liquid crystal (2B), and the refractive index of the blue-phase liquid crystals (2B) constituting the diffraction element (10) is changed by a voltage applied via the transparent electrodes (3, 4).

The invention provides a viewing angle controllable blue phase liquid crystal display comprising an upper substrate, a liquid crystal layer and a lower substrate. The upper substrate and the lower substrate are parallel to each other and respectively consist of main pixels and sub-pixels; the main pixels and sub-pixels are made of the same blue phase liquid crystal material; transparent strip pixel electrodes and transparent strip public electrodes are arranged at intervals on the lower substrate; the transparent strip electrodes of the upper substrate are arranged in the range of the sub-pixels of the upper substrate; the conversion between a narrow viewing angle mode and a wide viewing angle mode is achieved by selecting whether to apply an offset voltage to the electrodes of the upper substrate. The viewing angle controllable blue phase liquid crystal display has a good viewing angle control effect, high transmission rate and a simple manufacturing process and is simple and convenient to operate.

The invention provides a liquid crystal display device which has blue phase liquid crystal. The liquid crystal display device comprises a plurality of electrodes. In the invention, at least one pair of electrodes is arranged on one side of the blue phase liquid crystal to supply a transverse electric field to drive the macromolecular stabilized positive type blue phase liquid crystal for increasing the penetration rate of the light and controlling the bright state of the liquid crystal display device; and at least one pair of electrodes are arranged on the opposite sides of the blue phase crystal liquid to supply a vertical electric field, so the macromolecular stabilized positive type blue phase liquid crystal has excellent optical isotropy in a dark state and light leak in the dark state is reduced.

A liquid crystal display device includes: first and second substrates facing and spaced apart from each other; a plurality of insulating patterns on an inner surface of the first substrate; a plurality of pixel electrodes and a plurality of common electrodes on the plurality of insulating patterns, the plurality of pixel electrodes alternating with the plurality of common electrodes, the adjacent pixel and common electrodes generating a horizontal electric field according to a driving voltage; and a liquid crystal layer between the first and second substrates, the liquid crystal layer including one of a blue phase liquid crystal molecules and a uniform standing helix liquid crystal molecules.

The invention discloses a single cell-gap transflective blue phase LCD with matched transflective electro-optical characteristic curves. The single cell-gap transflective blue phase LCD is characterized in that the transmissive region and the reflective region of the LCD have an identical cell thickness; an upper substrate includes a glass layer, a quarter-wave plate, a half-wave plate and a polarizer; a lower substrate includes a glass layer, a quarter-wave plate, half-wave plate and a polarizer; and the reflective layer of the reflective region is arranged in the lower glass substrate. Bump electrodes of the reflective region are only arranged on the glass layer of the lower substrate; bump electrodes of the transmissive region are arranged below the glass layer of the upper substrate and on the glass layer of the lower substrate; the bump electrode consists of pixel electrodes and common electrodes arranged alternately at intervals; the bump electrodes are identical in the size, and adjacent two bump electrodes have an identical gap; and the transflective electro-optical characteristic curves can be matched with each other by adjusting the thickness of the liquid crystal cell. In addition, the single cell-gap transflective blue phase LCD has low work voltage and wide visual angle.

The invention discloses a 2D/3D (Two-dimensional/three-dimensional) switchable auto-stereoscopic display device based on a blue phase liquid crystal lens. The device comprises a blue phase liquid crystal lens and a 2D display screen; and the blue phase liquid crystal lens is arranged right above the 2D display screen. The blue phase liquid crystal lens comprises an upper substrate glass layer, an upper substrate ITO (Indium Tin Oxide) transparent arc-shaped electrode, an upper substrate polymer layer, a blue phase liquid crystal layer, a lower substrate ITO transparent planar electrode and a lower substrate glass layer. The 2D/3D switchable auto-stereoscopic display device based on the blue phase liquid crystal lens provided by the invention realizes the switching of a 2D mode and a 3D mode in the auto-stereoscopic display through the control of voltage; when the voltage does not exist between the upper substrate ITO transparent arc-shaped electrode and the lower substrate ITO transparent planar electrode, a 2D display screen displays 2D images without parallax errors, and at the moment, the device works in the 2D mode; and when the voltage is applied between the upper substrate ITO transparent arc-shaped electrode and the lower substrate ITO transparent planar electrode, the 2D display screen displays the 2D images with left and right parallax errors, and at the moment, the device works in the 3D mode.

The invention discloses a single-box thick transflective blue phase liquid crystal display with low operating voltage and high optical efficiency. The transflective liquid crystal display is characterized in that a transmissive area and a reflecting area have the same liquid crystal box thickness; an upper substrate comprises an upper substrate glass layer, an upper substrate quarter wave plate, an upper substrate half wave plate and an upper substrate polarizing plate; a lower substrate comprises a lower substrate glass layer, a lower substrate quarter wave plate, a lower substrate half wave plate and a lower substrate polarizing plate; and a reflecting layer of the reflecting area is arranged inside the lower substrate glass substrate. A bottom edge for arranging transparent wedge electrodes is arranged on the upper substrate glass layer and the lower substrate glass layer, and an area opposite to the right angle edge of the transparent wedge electrodes is the transmissive area, and an area opposite to the oblique angle edge of the transparent wedge electrodes is the reflecting area. A gap between adjacent transparent wedge electrodes on the transmissive area is smaller than a gap between adjacent transparent wedge electrodes on the reflecting area, and the transparent wedge electrodes comprise alternately arranged pixel electrodes and common electrode. By adjusting the liquid crystal box thickness, the height and the bottom edge width of the transparent wedge electrodes and the gaps between the adjacent transparent wedge electrodes on the transmissive area and on the reflecting area, the single-box thick blue phase liquid crystal display has the characteristics of low operating voltage, high optical efficiency, wide visual angle and the like.

The invention discloses a blue phase liquid crystal display device and a manufacturing method thereof, and the method comprises the following steps: configuring a first substrate opposite to and parallel with a second substrate, wherein the first substrate comprises a first electrode, and the second substrate comprises a second electrode; configuring a blue phase liquid crystal layer between the first substrate and the second substrate, wherein the blue phase liquid crystal layer comprises homocercal blue phase liquid crystals and polymer monomers; applying pressure on the first electrode andthe second electrode to form a vertical electric field in the blue phase liquid crystal layer; and enabling a light source to irradiate in the blue phase liquid crystal layer to carry out polymerization on the polymer monomers to generate macromolecule stabilized homocercal blue phase liquid crystals. In addition, a blue phase liquid crystal display device is disclosed in the invention.

The invention discloses a blue-phase liquid crystal panel and a display device, which belong to the field of liquid crystal panel design and manufacture, and are used for providing a transmission and reflection type blue-phase liquid crystal panel with single cell thickness and simplifying the technological difficulty. The blue-phase liquid crystal panel includes a first substrate and a second substrate folded to form a box, and a blue-phase liquid crystal layer positioned between the two substrates, as well as a grid line positioned on the inner side of the first substrate, a data line crossed with the grid line, and strip-shaped electrodes positioned in a pixel area defined by the grid line and the data line; the blue-phase liquid crystal panel is in single cell thickness; the pixel area is divided into a transmission area and a reflecting area; and the distance of the adjacent strip-shaped electrodes positioned in the transmission area of the same layer is smaller than that of the adjacent strip-shaped electrodes in the reflecting area, so that light rays of the transmission area and the reflecting area in the same pixel area generate the same phase delay when penetrating through the blue-phase liquid crystal layer.

The invention provides a blue-phase-liquid-crystal-microlens-array-based integrated imaging display device. The blue-phase-liquid-crystal-microlens-array-based integrated imaging display device comprises image display equipment and a blue-phase liquid crystal microlens array, wherein the image display equipment is used for displaying a 2D (Two-Dimensional) image or a micro-image array and is placed at a position a certain distance behind the blue-phase liquid crystal microlens array, and the centers of the image display equipment and the blue-phase liquid crystal microlens array are aligned. When an appropriate drive voltage V0 is applied to the blue-phase liquid crystal microlens array and the image display equipment displays the 2D image, the blue-phase-liquid-crystal-microlens-array-based integrated imaging display device realizes 2D display; when an appropriate drive voltage unequal to V0 is applied to the blue-phase liquid crystal microlens array and the image display equipment displays the micro-image array, the blue-phase-liquid-crystal-microlens-array-based integrated imaging display device realizes integrated imaging 3D (Three-Dimensional) display; and the improvement on the integrated imaging display performance can also be achieved through reasonably setting and regulating the drive voltage of the blue-phase liquid crystal microlens array of the blue-phase-liquid-crystal-microlens-array-based integrated imaging display device.

The invention provides a blue-phase liquid crystal composite material and a liquid crystal display comprising the same, belonging to the technical field of liquid crystal materials, and aiming at solving the problems of high drive voltage and electrooptic hysteresis of an existing blue-phase liquid crystal material and the liquid crystal display comprising the same. The blue-phase liquid crystal composite material is formed by raw components through photopolymerization, wherein the raw components comprise a parent blue-phase liquid crystal, an optical polymerizable monomer, a photoinitiator and an inorganic nanoparticle. A preparation system of the blue-phase liquid crystal composite material is stable, is simple in process, low in viscosity, low in drive voltage and high in electric field response speed, and has no electrooptic hysteresis.

A blue-phase liquid crystal composition comprises at least a main liquid crystal compound, a main dopant, a chiral dopant, a reactor monomer and a photoinitiator, wherein the main liquid crystal compound is represented by formula (1) shown in the description, wherein A, B and C represent benzene ring or hexamethylene respectively, and R1 and R2 respectively represent substituted or non-substituted alkyl having 1 to 12 carbon atoms, or substituted or non-substituted alkoxy having 1 to 12 carbon atoms. The main dopant comprises one of the formula (2) and the formula (3) shown in the description. The chiral dopant comprises one of the formula (4) and the formula (5) shown in the description. The reactor monomer comprises one of the formula (6) and the formula (7). R and R' respectively represent substituted or non-substituted alkyl having 1 to 12 carbon atoms, or substituted or non-substituted alkoxy having 1 to 12 carbon atoms.

A liquid crystal display device includes a first substrate, a second substrate, a first vertical electrode, a second vertical electrode, a first pixel electrode, a first counter electrode, and a liquid crystal layer. The second substrate is disposed to be opposite to the first substrate, the liquid crystal layer is interposed between the first and second substrates. The liquid crystal layer includes polymer stabilized positive blue phase liquid crystal. The first vertical electrode is at an inner side of the first substrate, and faces the second substrate. The second vertical electrode is at an inner side surface of the second substrate and faces the first vertical electrode. The second vertical electrode and the first vertical electrode have different electrical potentials thus form a vertical electric field perpendicular to the first substrate and the second substrate. The first pixel electrode is at the inner side of the first substrate and faces the second substrate. The first counter electrode is at an inner side of the first substrate. The first pixel electrode and the first counter electrode have different electrical potentials. The first pixel electrode and the first counter electrode provide a horizontal electric field parallel to the first substrate and the second substrate.

The invention discloses a transflective blue-phase LCD (Liquid Crystal Display) comprising an upper substrate, a liquid crystal layer and a lower substrate. The upper substrate and the lower substrate are arranged in parallel and respectively divided into a transmission area and a reflection area which are made the same blue-phase liquid crystal material; a transmission plane internal conversion electrode is formed by alternately arranging pixel electrodes and common electrodes; an etching area in the same depth is etched from the part between two adjacent transmission plane internal conversion electrodes of the transmission area to the inside of the glass layer of the lower substrate, and the reflection layer of the reflection area is arranged in the lower substrate; and the transmission area electrode generates an electric field in a double penetration depth so that the blue-phase liquid crystal arranged in the etching area contributes to the accumulation of phase delay to not only reduce the working voltage of a liquid crystal box, but also realize the phase delay match between the transmission area and the reflection area. The transmission area and the reflection area provided by the invention have the same liquid crystal box thickness, and the transmission plane internal conversion electrode and the electrode gap in the same size are adopted, thus the manufacture difficulty is reduced.

The invention relates to a blue-phase liquid crystal display device. The blue-phase liquid crystal display device structurally comprises an upper polaroid, an upper substrate, a middle part, a lower substrate and a lower polaroid; the lower polaroid, the lower substrate, the middle part, the upper substrate and the upper polaroid are sequentially arranged from bottom to top according to an incident light passing sequence; and the middle part consists of blue-phase liquid crystals (BPLC), a first Pixel electrode, a second Pixel electrode, a fine gap, an insulating layer, a Common electrode and a bulge. According to the invention, by introducing the fine gap structure and the bottom surface Common electrode and through an edge field formed by the Pixel electrodes and the Common electrode, the light transmissivities of the upper parts of the electrodes are effectively improved, so that the light utilization rate of a blue-phase liquid crystal display is effectively improved. Meanwhile, the Pixel electrodes and the Common electrode below the Pixel electrodes can be used as storage capacitances, so that separate manufacturing of the storage capacitances is reduced and the actual aperture ratio (the light transmittance area) of the blue-phase liquid crystal display is improved.

The invention discloses a holographic PDLC (polymer dispersed liquid crystal) raster and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing a prepolymer formed by a monomer, a cross-linking agent, an auxiliary initiating agent and a photo sensitized initiation agent and nematic phase liquid crystal, and injecting the mixture into a liquid crystal box; conducting photopolymerization in a holographic interference optical field to form a holographic PDLC raster, and fixing the PDLC raster; then putting the liquid crystal box in an organic solvent to clean the nematic phase liquid crystal and residue which is not reacted completely; injecting blue phase liquid crystal to the liquid crystal box to obtain the holographic PDLC raster. According to the invention, the obtained holographic PDLC raster can be provided with under millisecond response time by reducing the driving voltage of the holographic PDLC raster.